Lock circuit-closer.



Patented Dec. 22, 1914.

.JNVENTOR.

fIM i V////////////J v J. P. LESKO.

LOOK CIRCUIT CLOSER.

APPLIOATION FILED MAY 20, 1914,

. THE NORRIS PETERS 50.. PHOTO-LITHQ, WASHINGTON, L .Y

UNITED STATES PATENT OFFICE.

JAMES F. LEfiKO, OF CHICAGO, ILLINOIS, ASSIGNOR- OF ONE-HALF TO TIMSELF AND ONE-HALF TO ALBERT J. FRANEK, BOTH 0F UTZICAGG, ILLINOIS.

LOCK CIRCUIT-CLUSER.

Specification of Letters Patent.

Patented Dec. 22, 1914.

Application filed. May 20, 1914. SeriaI No. 839,713.

To all whom it may concern Be it known that T, JAMES F. Lnsno, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Lock Circuit-Closers, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to improvements in electrical burglar alarms, and has for its object to provide an improved mechanism for causing an alarm to be given when either or both of the locking devices carried by a moving member, as a door, are retracted from locking position. I accomplish this object by the means shown in the drawing and hereinafter specifically described.

That which I believe to be new will be set forth in the claims.

In the drawings,Figure 1 is a perspective view of the block adapted to be secured to the of a doorway to which block is attached my improved mechanism, said figure also showing a circuit-wire and an ordinary alarm-bell; Fig. 2 is a similar view of the block and attached parts, but looking at opposite faces of the block; Fig. 3 is a. front view of the block shown in Figs. 1 and 2, but with the stem of the operating handle or switch in section; Fig. 4 is a vertical section, but on a smaller scale, taken at line l% of Fig. 3; *ig. 5 is a vertical section through a part of a door and the jamb that such door has locking engagement with, the section being taken at line 55 of Fig. 6, my improvements being shown applied to the jamb; and Fig. 6 is a horizontal section taken at line 6-6 of Fig. 5.

Referring to the several figures of the drawing, in which corresponding parts are indicated by like reference characters, A indicates a portion of an ordinary door provided with the usual two locking devices, viZ., the knob-operated spring-latch a and the key-operated locking-bolt a.

B indicates the jamb opposite the free edge of the door A, in the edge of which j amb is cut the usual socket 6 into which the latch a and bolt a are adapted to project through the usual openings in the coveringplate or keeper 5'. Such covering-plate or keeper 6 is usually provided with a lateral extension. as at 25 against which the springlatch a strikes when the door is being closed,

and, in the construction illustratechl have shown that portion of the jamb B behind such extension cut away to form a recess to receive the block to which the operative parts of my improved mechanism are attached. 10 indicates said block, which may be formed of fiber or other suitable nonconducting material. It is adapted to be secured in place to the jamb by screws passing through the holes 11.

12 and 13 indicate two similar metal arms, each secured at one end portion, as by a screw, as shown, to the front face of the block 10, and bent to lie alongside of one of the side faces of the block. The rear end portion of each arm is bent to lie opposite to and extend out from the rear face of the block, as clearly shown in Fig. 6. The two arms are spaced a distance apart from each other to correspond to the distance apart of the spring-latch a and locking-bolt a, and their free bent ends lie in such position in the socket b that they will be contacted and pushed back by such latch and bolt when the latch and bolt are in locking position.

As shown in Fig. 6 and indicated by 14:, the inner wall of the recess that receives the block 10 is cut away in a diagonal manner to permit such pushing back of the arms. The said arms are of spring material and so constructed that when not pushed back as described they will tend to press toward and against the side face of the block 10.

17 indicates a metal plate suitably attached to the rear of the block 10 and provided with two laterally-projecting contacts 15 and 16 with which the free ends of the arms 12 and 13, respectively come in contact when such arms are free from engagement with the locking members a. 6/. These contacts are clearly shown in Fig. 1.

18 indicates e stem secured in the block 10 and projecting from the front face thereof. As shown. it is engaged by a screw 19 inserted through that side of the block where the spring arms 12 and 18 are located, and, incidentally, such screw 19 serves to retain in place a small plate 20 that has an end portion bent around against the front face of the block, and through this turned end portion the stem 18 passes and is thereby held more rigidly.

21 indicates a rotatable switch mounted on that portion of the stem 18 that projects from the front face of the block 10. It is hollow, as seen by reference to Fig. 4c, and within it is a coiled spring 22 that bears at its outer end against a small head 23 on the end of the stem 18 and-at its other end against the inner end of the switch, thus tending to force the switch with the required firmness toward the block. The inner end of the switch is enlarged to form a disk, indi cated by 23 and that face thereof next to the block is provided with three contacts 24.

As best shown in Fig. 3, the end portions of the arms 12 and 13 that rest against the front face of the block are each provided with an extension 25 directed toward each other, and the disk-shaped end 23 of the switchunember 18 overlies such extensions 25 suificiently to permit the contacts 24 to bear against them. These arms 12 and 13' are best fitted in correspondingly-shaped shallow channels in the block so that their outer faces are flush with the surface of the block, and thus enable the contact points 2% to be more readily moved on to or ofi' of the said arm-extensions 25.

28 indicates a battery, 27 a circuit-wire leading from the poles thereof, and 28 an ordinary alarm-bell in the circuit. One end of the wire 27 is suitably connected to the metal plate 17 on the inner face of the block 10 and the other end to the screw 19 that is in engagement with the stem 18.

In use, with thedoor closed and locked,

when it is desired that an alarm be sounded when either the spring-latch a or the keyoperated bolt a is retracted from the keeper, the switch 21 will be turned and left with two of its three contacts at bearing against the extensions 25 of the spring-arms 12 and 13. If thereafter the door-knob be turned so as to draw back the spring-latch a, the arm 12 will spring toward the block and against the contact 15 on the plate 17, thus closing the circuit and ringing the bell. If for any reason the circuit is not properly closed through the arm 12, the retraction of the key-operated bolt (1 will allow the arm 13 to close the circuit by springing forward against its contact 16. Thus the door cannot be unlocked or disengaged from the jamb B without sounding an alarm. If it be desired that the alarm be actuated only by the retraction of the latch a, the switch 21 would be given a quarter turn in counterclockwise direction from the position shown in Fig. 3, bringing contacts 24 into engagement with the plate and the arm-extem sion 25 of the arm 12 and throwing the arm 13 out of the circuit. If it be desired that the alarm be actuated only upon the retraction of the key-operated bolt 61, the switch 21 would be given a quarter turn in clockwise direction from the position shown in Fig. 3, bringing contacts 2 1 into engagement with the plate 20 and the armeXtension of the arm 13 and throwing the arm 12 out of the circuit. To throw the alarm mechanism entirely out of operative position the switch can be turned so that the contacts will all be as indicated by the dotted circles in said Fig. 3.

That which 1 claim as my invention, and desire to secure by Letters Patent, is,

1. The combination with a door provided with a plurality of locking devices, and a jamb having a socket to receive said looking devices, of a block of non-conducting material carried by said jamb, movable metal arms spaced a distance apart and supported by said block, a portion of each arm projecting into the path of one of said locking devices and adapted to be engaged thereby, a circuit, and a switch adapted to be brought into contact with one or both of the arms to close the circuit when the door is unlocked.

2. The combination with a movable member having a plurality of locking devices, and a fixed member having a socket to receive such locking devices, of a block on said fixed member, movable arms carried by said block and projecting, respectively, into the paths of said locking devices, said arms being spaced a distance apart, a rotatable switch mounted on said block be tween said arms and adapted to make electrical contact with either or both of the arms, and an electric circuit adapted to be closed by the movement of either arm when the corresponding locking device is retracted.

JAMES F. LESKO.

\Vitnesses MINNIE A. HUNTER, WILLIAM A. FURNNER.

- Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

